I've found some lovely Bladed Rhino Beetles and Electric Rhino Beetles and travelling merchant and noted insect enthusiast (and arrow extortionist) Beedle, who hangs out at the various stables around Hyrule, has gone nuts for them and likes to demand that I trade them to him. He's offered a (fairly weak) Mighty Elixir, or some food. Is this a good trade? Will he offer any further rewards if I give him enough Beetles? Or should I hold on to my bugs?
Zelda Breath of the Wild – Should Beetles Be Given to Beedle?
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Since the before-hand cut scenes only go into so much explanation about who the champions are or were, we can only get a few small pieces of information as to who they were as people. It's been 100 years and most of their abilities are either legend or forgotten.
For Mipha, it seems that she just has a natural ability to heal. That could mean that she was born to have healing ability out of the gate without any bloodline telling her she could, since her brother exhibits none of this. Neither does her father. We can take from that the idea the Mipha's is special to her.
Daruk obviously has his from a blood line. His entire family has had this power and will always have this power. His ancestor has it, so we know it travels down generations. Daruk's parents and so forth must have had it too. From that, we can take that it's a different source than Mipha's.
Revali doesn't seem to have a magical ability through blood line or special gift. His seems more like he's honed and trained himself to have this special ability. He brags about it like he's been able to master a technique that no other Rito has been able to emulate. In this way, it seems his power is more a hidden talent or trained magic.
So, looking at what we know about Urbosa, a number of theories could be created. Maybe her Divine Beast gave her the ability to unleash lightning so she could better control it. Maybe she just naturally was able to contain the Divine Beast's power and can command it's lightning at will. We know from previous Zelda games that Farore's element is wind. Wind is close to lightning in most elemental cases, which also explains things like the Ether medallion in Link to the Past. And since Farore's dragon is also present with lightning, we could infer that Urbosa is blessed by one of the goddesses, which is why she's not scared of the lightning. She doesn't fear it, because Farore protects her (even if she doesn't know who Farore is, really).
Not enough to go on, but since I believe each champion has their own sources for their powers, Urbosa's could simply be another facet of power that we never see the source of, because it doesn't really matter for the context of the rest of the story.
You need to progress further on the main quest to get access to the Camera Rune.
After finishing the Great Plateau, you should've gotten a quest to go visit Impa called Seek Out Impa. Complete that quest, and do what Impa tells you to do there.
Impa will then give you a quest to go seek out Purah in Hateno Village called Locked Mementos. After meeting Purah, she will give you a task to go retrieve a blue flame. Complete this and she will give you the Camera Rune.
Best Answer
15 Electric Rhino Beetles are used for upgrading some particular pieces of equipment. See below for end game spoilers:
Other than that, there are no other uses for Beetles. So feel free to give them to Beedle to make him happy, or keep them for making elixirs. The reward from Beedle doesn't improve beyond a relatively low strength Mighty Elixir.